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Title (Primary) Membrane-based characterization of a gas component — a transient sensor theory
Author Lazik, D.;
Journal Sensors
Year 2014
Department BOPHY;
Volume 14
Issue 3
Language englisch;
POF III (all) T16; T31;
Keywords sensor; membrane; selectivity; gas; identification; discrimination; quantification
UFZ wide themes RU1
Abstract Based on a multi-gas solution-diffusion problem for a dense symmetrical membrane this paper presents a transient theory of a planar, membrane-based sensor cell for measuring gas from both initial conditions: dynamic and thermodynamic equilibrium. Using this theory, the ranges for which previously developed, simpler approaches are valid will be discussed; these approaches are of vital interest for membrane-based gas sensor applications. Finally, a new theoretical approach is introduced to identify varying gas components by arranging sensor cell pairs resulting in a concentration independent gas-specific critical time. Literature data for the N2, O2, Ar, CH4, CO2, H2 and C4H10 diffusion coefficients and solubilities for a polydimethylsiloxane membrane were used to simulate gas specific sensor responses. The results demonstrate the influence of (i) the operational mode; (ii) sensor geometry and (iii) gas matrices (air, Ar) on that critical time. Based on the developed theory the case-specific suitable membrane materials can be determined and both operation and design options for these sensors can be optimized for individual applications. The results of mixing experiments for different gases (O2, CO2) in a gas matrix of air confirmed the theoretical predictions.
ID 14648
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=14648
Lazik, D. (2014):
Membrane-based characterization of a gas component — a transient sensor theory
Sensors 14 (3), 4599 - 4617